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the sum of n terms of an A.P. is 3n 2 +5. the number of term which equals 159 is????

the sum of n terms of an A.P. is 3n2 +5. the number of term which equals 159 is????

Grade:12th pass

1 Answers

aarthi s
19 Points
8 years ago
Tn=Sn-(Sn-1)
Tn=159
Sn=3n^2+5
Sn-1=3(n-1)^2+5
substitute these values and you get 27

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